12105531 has 24 divisors (see below), whose sum is σ = 18729984. Its totient is φ = 7805160.

The previous prime is 12105529. The next prime is 12105551. The reversal of 12105531 is 13550121.

It is not a de Polignac number, because 12105531 - 2¹ = 12105529 is a prime.

It is a super-2 number, since 2×12105531² = 293087761583922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12105551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6730 + ... + 8336.

It is an arithmetic number, because the mean of its divisors is an integer number (780416).

Almost surely, 2^12105531 is an apocalyptic number.

12105531 is a deficient number, since it is larger than the sum of its proper divisors (6624453).

12105531 is an equidigital number, since it uses as much as digits as its factorization.

12105531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653 (or 1641 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 12105531 is about 3479.3003607047. The cubic root of 12105531 is about 229.6120175959.

Adding to 12105531 its reverse (13550121), we get a palindrome (25655652).

The spelling of 12105531 in words is "twelve million, one hundred five thousand, five hundred thirty-one".